Discovering independent parameters in complex dynamical systems

Claudia Lainscsek (1) , Jonathan Weyhenmeyer (1) , Terrence J. Sejnowski (2) , Christophe Letellier (3)

1 The Salk Institute for Biological Studies
2 Computational Neurobiology Laboratory
3 CORIA - Complexe de recherche interprofessionnel en aérothermochimie

The transformation of a nonlinear dynamical system into a standard form by using one of its variables and its successive derivatives can be used to identify the relationships that may exist between the parameters of the original system such as the subset of the parameter space over which the dynamics is left invariant. We show how the size of the attractor or the time scale (the pseudo-period) can be varied without affecting the underlying dynamics. This is demonstrated for the Rossler and the Lorenz systems. We also consider the case when two Rossler systems are unidirectionally coupled and when a Lorenz system is driven by a Rossler system. In both cases, the dynamics of the coupled system is affected. (C) 2015 Elsevier Ltd. All rights reserved.

Domaines: Sciences de l'ingénieur [physics]

Claudia Lainscsek, Jonathan Weyhenmeyer, Terrence J. Sejnowski, Christophe Letellier. Discovering independent parameters in complex dynamical systems. Chaos, Solitons & Fractals, 2015, 76, pp.182--189. ⟨10.1016/j.chaos.2015.04.001⟩. ⟨hal-01612373⟩